Transmission electron microscopy (TEM) was used to study the structure of particles of CO2-asphaltenes precipitated from a goudron vacuum residue sample in the gas anti-solvent (GAS) process using heptane, toluene, and their mixture (heptol) as diluents. It was shown that CO2-asphaltenes, despite lower aromaticity and polarity compared to C7-asphaltenes, have a similar irregular layered internal structure, as well as a close distribution of the aromatic layers and similar distance between the layers in the packed crystallites.. The type of the diluent used affects not only the yield and composition of the precipitated CO2-asphaltenes, but also the degree of order and the size of layers of aromatic fragments of the molecules forming their structure. In this respect, toluene as a diluent ensures the formation of CO2 asphaltenes that are comparable to C7-asphaltene particles in their molecular structure and structural parameters.

中文翻译：

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用各种有机稀释剂沉淀的 Goudron CO2 沥青质颗粒的结构特征

透射电子显微镜 (TEM) 用于研究在气体反溶剂 (GAS) 过程中使用庚烷、甲苯及其混合物 (庚醇) 作为稀释剂从 goudron 真空残留样品中沉淀出的 CO2-沥青质颗粒的结构。结果表明，尽管与 C7-沥青质相比，CO2-沥青质具有较低的芳香性和极性，但具有相似的不规则层状内部结构，以及芳香层的紧密分布和填充微晶中层之间的相似距离。所用稀释剂的类型不仅影响沉淀的 CO2-沥青质的产率和组成，而且影响形成其结构的分子的芳族片段层的有序度和大小。在这方面，